Finding the Fourth Proportional to 90,752.64, 136,141.92 and 28,428

Step by Step Solution

1. Step 1: Write the proportion equation
   90,752.64 : 136,141.92 = 28,428 : x
2. Step 2: Convert to fraction form
   90,752.64/136,141.92 = 28,428/x
3. Step 3: Cross multiply
   90,752.64x = 136,141.92 × 28,428
4. Step 4: Simplify right side
   90,752.64x = 3,870,242,501.76
5. Step 5: Solve for x
   x = 3,870,242,501.76/90,752.64
6. Step 6: Final answer
   x = 42,646.06